// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: wsfuyibing <682805@qq.com>
// Date: 2024-12-10

package filter

// Operator is a type name for condition generator.
type Operator string

const (
	OperatorEqual        Operator = "=="
	OperatorGreater      Operator = ">"
	OperatorGreaterEqual Operator = ">="
	OperatorIn           Operator = "IN"
	OperatorLess         Operator = "<"
	OperatorLessEqual    Operator = "<="
	OperatorNotEqual     Operator = "!="
	OperatorNotIn        Operator = "NOT IN"

	OperatorEqual2    Operator = "="
	OperatorNotEqual2 Operator = "<>"
	OperatorNotIn2    Operator = "NOTIN"

	undefinedOperator Operator = ""
)

func (o Operator) Defaulter() Operator {
	switch o {
	case OperatorEqual2:
		return OperatorEqual
	case OperatorNotEqual2:
		return OperatorNotEqual
	case OperatorNotIn2:
		return OperatorNotIn
	}
	return o
}

func (o Operator) IsEqual() bool { return o == OperatorEqual }
func (o Operator) IsIn() bool    { return o == OperatorIn }

func (o Operator) String() string  { return string(o) }
func (o Operator) Undefined() bool { return o == undefinedOperator }
